plans shifted or having to change because of the hurricane. The hurricane not volcano having a major impact on east coast travel. But it's having a ripple effect across the country. Bazi kanani is at Reagan national airport. Reporter: This is expected to be the busiest weekend for fourth of July travelers. And for many, it's off to a rough start. A double-whammy, for many of the 41 million Americans on the move this weekend. Drivers in the northeast are dealing with heavy rains and flooding on the road. Amtrak says power outages and downed trees delayed their times last night. And they expect more today. Hundreds of flights have been canceled in the northeast because of hurricane Arthur. And that leads to delays elsewhere as connecting flights are affected. I just checked the board here at Reagan national in D.C. So far, only about a dozen or so flights canceled. Having an impact on all sorts of travel out there.

This transcript has been automatically generated and may not be 100% accurate.